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Are you serious or is this Der snark?
The latter - I love how anyone who criticizes the political system is automatically demonized with all those bad words - angry, intemperate, too confronatational, etc. etc.
One can never know the authenticity of any politician, or any person for that matter. But there are some politicians who become more interesting and real once they're liberated from the fear of losing, once they've been through the political system long enough and realize how corrupt it is. I'd put Al Gore and Wesley Clark in that group, even Newt Gingrich (as much as I can't stand him; he's more interesting now than when he was desperate to win elections).
I think John Edwards has become that, too -- more emancipated from political constraints, speaking more from passion and authencticity, and therefore more interesting (and scarier to the political establishment, which hates/fears passion -- at least populist passion -- more than it hates/fears anything else).